package com.itheima.ssm.controller;

import com.itheima.ssm.domain.SysLog;
import com.itheima.ssm.service.ISysLogService;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Date;

@Component
@Aspect
public class LogAop {

    @Autowired
    private HttpServletRequest request;

    @Autowired
    private ISysLogService sysLogService;

    private Date visitTime;  //开始事件
    private Class clazz;  //访问的类
    private Method method;  //访问的方法

    //前置通知  主要是获取开始事件，执行的类是哪一个,执行哪个方法
    @Before("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doBefore(JoinPoint jp) throws NoSuchMethodException {
        visitTime = new Date(); //当前时间就是开始时间
        clazz = jp.getTarget().getClass(); //具体要访问的类
        String methodName = jp.getSignature().getName();  //获取访问方法的名称
        Object[] args = jp.getArgs();

        //获取具体执行的方法的Method对象
        if (args == null || args.length==0){
            method = clazz.getMethod(methodName);  //只能获取无参数的方法

        }else {
            Class[] classArgs = new Class[args.length];
            for (int i = 0;i<args.length;i++){
                classArgs[i] = args[i].getClass();
            }
            clazz.getMethod(methodName,classArgs);
        }


    }

    //前置通知
    @After("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doAfter(JoinPoint jp) throws Exception {

        long time = new Date().getTime()-visitTime.getTime(); // 获取访问时长
        String url = "";

        //获取url
        if (clazz!=null && method !=null && clazz != LogAop.class){
            //获取类上的@RequestMapping("/orders)
            RequestMapping classannotation = (RequestMapping)clazz.getAnnotation(RequestMapping.class);
            if (classannotation != null){
                String[] classValue = classannotation.value();

                //获取方法上的@RequestMapping
                RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);
                if (methodAnnotation != null ){
                    String[] methodValue = methodAnnotation.value();
                    url = classValue[0] + methodValue[0];

                    //获取访问的ip地址
                    String ip = request.getRemoteAddr();

                    //获取当前操作的用户
                    SecurityContext context = SecurityContextHolder.getContext();  //从上下文中获取当前登录的用户
                    User user = (User) context.getAuthentication().getPrincipal();
                    String username = user.getUsername();

                    //将日志相关信息封装到SysLog对象
                    SysLog sysLog = new SysLog();
                    sysLog.setExecutionTime(time);
                    sysLog.setIp(ip);
                    sysLog.setMethod("类名 " + clazz.getName() + "方法名 " + method.getName());
                    sysLog.setUrl(url);
                    sysLog.setUsername(username);
                    sysLog.setVisitTime(visitTime);

                    //调用service完成数据库的操作
                    sysLogService.save(sysLog);

                }

            }

        }


    }

}
